On wednesday 2/14 I went to a ballet performance in SL - with custom animations and original music and gorgeous sets.
On the Roma sim on Thursday (and I think friday) there's a big celebration with some big event each night at 9pm (est). Definitely sounds worth checking out.
On Saturday at 7pm (EST) there's a basic machinima class
And - this is the coolest - on Tuesday night at 11pm (est) there's a talk at the International SL Space Museum by an astronomer who was part of the team that found evidence that the universe is expanding. COuld be very cool.
SL - It's not just sex and shopping anymore